Turned out to be simply this, where Point objects are delivered by mouseClicking on 
the image:

public void setSelection(Point start, Point end)
{
 int w = Math.abs(start.x - end.x);
 int h = Math.abs(start.y - end.y);
 subBufImg = bufImg.getSubimage(start.x, start.y, w, h);
}

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